PCB 422E54 In Line Charge Converter Instruction Manual

PCB 422E54 In Line Charge Converter

Product Information

Model 422E54 IN-LINE CHARGE CONVERTER

The Model 422E54 IN-LINE CHARGE CONVERTER is a device designed to convert the high impedance charge signal from a charge mode transducer to a low impedance voltage signal. This conversion is accomplished using a feedback capacitor across an inverting amplifier, resulting in a voltage output.

The charge amplifier gain is virtually independent of input capacitance loading, ensuring accurate measurements. The device also features a feedback resistor and capacitor that establish the time constant for low-frequency response. The 422E54 series is suitable for low-level and remote measurements, improving signal-to-noise ratio and retaining high-frequency signals.

Product Usage Instructions

Operating Instructions 422E5X Series

1. Connect the charge mode transducer to the input of the Model422E54 IN-LINE CHARGE CONVERTER.
2. Ensure that the feedback capacitor and resistor are properlyconnected.
3. Connect the output of the Model 422E54 to the desiredmeasurement or data acquisition system.
4. Power on the device using the appropriate power source.
5. Monitor the output voltage signal to observe the measurementsfrom the charge mode transducer.

Note: Calibration of the device is recommended to maintain measurement accuracy. It is advised to recalibrate the device annually or after exposure to severe temperature extremes, shock, load, or other environmental influences. Refer to the product warranty for further details.

The information contained in this document supersedes all similar information that may be found elsewhere in this manual.

Total Customer Satisfaction – PCB Piezotronics guarantees Total Customer Satisfaction. If, at any time, for any reason, you are not completely satisfied with any PCB product, PCB will repair, replace, or exchange it at no charge. You may also choose to have your purchase price refunded in lieu of the repair, replacement, or exchange of the product.
Service – Due to the sophisticated nature of the sensors and associated instrumentation provided by PCB Piezotronics, user servicing or repair is not recommended and, if attempted, may void the factory warranty. Routine maintenance, such as the cleaning of electrical connectors, housings, and mounting surfaces with solutions and techniques that will not harm the physical material of construction, is acceptable. Caution should be observed to insure that liquids are not permitted to migrate into devices that are not hermetically sealed. Such devices should only be wiped with a dampened cloth and never submerged or have liquids poured upon them.
Repair – In the event that equipment becomes damaged or ceases to operate, arrangements should be made to return the equipment to PCB Piezotronics for repair. User servicing or repair is not recommended and, if attempted, may void the factory warranty.
Calibration – Routine calibration of sensors and associated instrumentation is recommended as this helps build confidence in measurement accuracy and acquired data. Equipment calibration cycles are typically established by the users own quality regimen. When in doubt about a calibration cycle, a good “rule of thumb” is to recalibrate on an annual basis. It is also good practice to recalibrate after exposure to any severe temperature extreme, shock, load, or other environmental influence, or prior to any critical test.
PCB Piezotronics maintains an ISO-9001 certified metrology laboratory and offers calibration services, which are accredited by A2LA to ISO/IEC 17025, with full traceablility to N.I.S.T. In addition to the normally supplied calibration, special testing is also available, such as: sensitivity at elevated or cryogenic temperatures, phase response, extended high or low frequency response, extended range, leak testing, hydrostatic pressure testing, and others. For information on standard recalibration services or special testing, contact your local PCB Piezotronics distributor, sales representative, or factory customer service representative.
Returning Equipment – Following these procedures will insure that your returned materials are handled in the most expedient manner. Before returning any equipment to PCB Piezotronics, contact your local distributor, sales representative, or factory customer service representative to obtain a Return Materials Authorization (RMA) Number. This RMA number should be clearly marked on the outside of all package(s) and on the packing list(s) accompanying the shipment. A detailed account of the nature of the problem(s) being experienced with the equipment should also be included inside the package(s) containing any returned materials.
A Purchase Order, included with the returned materials, will expedite the turn-around of serviced equipment. It is recommended to include authorization on the Purchase Order for PCB to proceed with any repairs, as long as they do not exceed 50% of the replacement cost of the returned item(s). PCB will provide a price quotation or replacement recommendation for any item whose repair costs would exceed 50% of replacement cost, or any item that is not economically feasible to repair. For routine calibration services, the Purchase Order should include authorization to proceed and return at current pricing, which can be obtained from a factory customer service representative.
Warranty – All equipment and repair services provided by PCB Piezotronics, Inc. are covered by a limited warranty against defective material and workmanship for a period of one year from date of original purchase. Contact  PCB for a complete statement of our warranty. Expendable items, such as batteries and mounting hardware, are not covered by warranty. Mechanical damage to equipment due to improper use is not covered by warranty. Electronic circuitry failure caused by the introduction of unregulated or improper excitation power or electrostatic discharge is not covered by warranty.
Contact Information – International customers should direct all inquiries to their local distributor or sales office. A complete list of distributors and offices can be found at www.pcb.com. Customers within the United States may contact their local sales representative or a factory customer service representative. A complete list of sales representative, in the division responsible for this product, can be found on the title page at the front of this manual. Our ship to address and general contact numbers are:

CB Piezotronics, Inc.

• 3425 Walden Ave. Depew, NY 14043 USA
• Toll-free: 800-828-8840
• 24-hour SensorLineSM: 716-684-0001
• Website: www.pcb.com
• E-mail: info@pcb.com

INTRODUCTION

The 422E5X series charge amplifiers convert the high impedance charge signal from a charge mode transducer to a low impedance voltage signal.
This conversion is accomplished by the use of a feedback capacitor across an inverting amplifier (Fig 1). The gain of the amplifier is sufficiently high to make the charge amplifier gain virtually independent of input capacitance loading.

As in all charge amplifiers, the output is inverting. Thus, any sinusoidal signal will experience a 180 degree phase shift.

DESCRIPTION

The 422E5X series charge amps are .5 inch diameter by 3.4 inch long cylinders. One 10-32 jack functions as input, one BNC jack functions as output.
The amplifier operates on power supplied by an ICP® power unit via a simple two-wire coaxial cable. During operation, the electrical charge from the transducer is transferred to the feedback capacitor, resulting in a voltage given by the following equation:

• V = Q/Cf
• Q = the charge from the transducer
• Cf = the feedback capacitance

The accompanying 9V to 12V bias voltage is typically removed by a 10uF coupling capacitor internal to most PCB ICP® power units.
A feedback resistor between 107 and 1011 ohms (depending upon the specific model) neutralizes unwanted, slowly changing signal components resulting from temperature effects and transistor leakage. This resistor, along with the feedback capacitor establishes the time constant (low frequency response).
For low level measurements or remote measurements over long cables, the 422E5X series improves the signal to noise ratio and retains the high frequency signal. The 422E5X series requires little operator attention and operates relatively drift-free in a dynamic mode, an important consideration in multi- channel installations.

INSTALLATION

Connect the 422E5X to the transducer with low noise cable (003 type only). Standard coaxial cable may be used between the amplifier and power unit, and between the power unit and readout device. (Fig 2)
Connect case of unit to Earth ground with a low impedance connection to conform to CE.

 WARNING SYMBOLS AND TERMS

The following symbols and terms may be found on the equipment described in this manual. This symbol on the unit indicates that excessive accumulated charges on the input cable can destroy the field effect input transistor. These charges should be grounded out by shorting the center pin of the connector plug to the outer cable conductor with a metallic object before connecting them to the 422E5X charge amp. Care should be taken to avoid touching the input terminal to any object that could possess an electric charge
(such as your fingers).

This symbol on the unit indicates that the user should refer to the operating instructions located in the manual.

OPERATION

After connecting the 422E5X as indicated in Fig 2 Energize the system by turning on the power unit and waiting a few minutes for the amplifier to turn on. For a simple, self-test circuit, monitor the +9 to +12 V DC bias existing at the output during normal operation with a high impedance voltmeter. Many PCB power units feature such a test circuit (Fig 3).

SYSTEM SENSITIVITY
When the sensitivity (pC/unit) of the transducer is known (via calibration) along with the transfer sensitivity of the charge amp (mV/pC), the system sensitivity of the system can be calculated in the following manner:

• System sens = (Xdcr Sens)(Amp Sens)
• System sens is given in (mV/Unit) Xdcr Sens is given in (pC/Unit)
• Amp Sens is given in (mV/pC)

MAINTENANCE AND REPAIR

The 422E5X charge amplifier is hermetically sealed, and requires no maintenance. If the connectors become dirty, clean with lint-free wipes dampened with isopropyl alcohol. For extremely dirty or humid environments, the cable connections can be protected with low temperature heat shrink tubing. Should trouble occur, the factory should be contacted for assistance.

• MANUAL NUMBER: 25578
• MANUAL REVISION: A
• DIN NUMBER – 37900

IN-LINE CHARGE CONVERTER

Performance ENGLISH                          SI

• Sensitivity(± 2.5 %)(Charge Conversion)                                           0.1 mV/pC                           0.1 mV/pC
• Input Range                                                                                          ± 50,000 pC                        ± 50,000 pC
• Overrange                                                                                                   ± 8 V                                     ± 8 V
• Low Frequency Response(-5 %)                                                              5 Hz                                     5 Hz
• High Frequency Response(4 mA)                                                          12 kHz                                 12 kHz                  [3]
• High Frequency Response(20 mA)                                                        50 kHz                                 50 kHz                  [3]
• Non-Linearity                                                                                         ≤ 1.0 % FS                          ≤ 1.0 % FS

Environmental

• Temperature Range(Operating)                                                      -65 to +250 °F                                -54 to +121 °C
• Maximum Shock                                                                                    5000 g pk                        49,050 m/s² pk
• Maximum Vibration(5 to 2000 Hz)                                                        100 g pk                            981 m/s² pk

Electrical

• Excitation Voltage                                                                               18 to 28 VDC                      18 to 28 VDC
• Constant Current Excitation                                                                 2 to 20 mA                          2 to 20 mA
• Output Voltage                                                                                          ± 5.0 V                                 ± 5.0 V
• Output Impedance                                                                                  100 ohm                              100 ohm
• Output Bias Voltage                                                                             9 to 13 VDC                        9 to 13 VDC
• Maximum Input Voltage                                                                                                        40 V                                      40 V
• Broadband Electrical Noise(1 to 10,000 Hz)                                          33 µV                                   -90 dB                   [1]
• Spectral Noise(1 Hz)                                                                            9.8 µV/√Hz                             -100 dB                 [1]
• Spectral Noise(10 Hz)                                                                           3 µV/√Hz                              -110 dB                 [1]
• Spectral Noise(100 Hz)                                                                        0.8 µV/√Hz                             -122 dB                 [1]
• Spectral Noise(1 kHz)                                                                          0.4 µV/√Hz                             -128 dB                 [1]
• Spectral Noise(10 kHz)                                                                        0.2 µV/√Hz                             -134 dB                 [1]
• Capacitance(Feedback)                                                                       10,000 pF                            10,000 pF
• Overload Recovery Time                                                                        10 µsec                                10 µsec
• Discharge Time Constant                                                                      >0.1 sec                               >0.1 sec
• Resistance(Feedback)                                                                         6×107 ohm                          6×107 ohm              [2]
• Source Capacitance Loading                                                            0.0005 %/pF                       0.0005 %/pF

Physical

• Housing Material                                                                                Stainless Steel                   Stainless Steel
• Sealing                                                                                                               Epoxy                                          Epoxy
• Electrical Connector(Input)                                                           10-32 Coaxial Jack            10-32
• Coaxial Jack Electrical Connector(Output)                                                                                BNC Jack                            BNC Jack
• Size (Diameter x Length)                0.52 in x 3.4 in              13 mm x 86 mm
• Weight                           1.15 oz                           32.7 gm

All specifications are at room temperature unless otherwise specified.

In the interest of constant product improvement, we reserve the right to change specifications without notice.

ICP® is a registered trademark of PCB Group, Inc.

OPTIONAL VERSIONS

Optional versions have identical specifications and accessories as listed for the standard model except where noted below. More than one option may be used.

NOTES:

• Tested using voltage source and input capacitor equal to the feedback capacitor, to simulate a charge output sensor.
• Effective feedback resistance for time constant is 3 times tested value due to circuitry (i.e 1x10E9 = 3x10E9 ohm)
• High frequency response may be limited by supply current and output cable
• See PCB Declaration of Conformance PS024 for A low impendance connection from case to earth ground is required to maintain CE compliance.

31969

AV Al LAB LE CONNECTOR OPTIONS

• STANDARD MODEL NUMBER
• INPUT: l 0-32 MICRO DOT JACK
• OUTPUT: BNC JACK
• LENGTH: 3.4 [85)
• MODEL NO.IA
• INPUT: l 0-32 MICRO-DOT JACK
• OUTPUT: l 0-32 MICRO-DOT JACK
• LENGTH: 3.0 [76)
• MODEL NO.IC
• INPUT: l 0-32 MICRO-DOT JACK
• OUTPUT: BNC PLUG
• LENGTH: 3.2 [81)
• MODEL NO./D
• INPUT: BNC JACK
• OUTPUT: BNC JACK
• LENGTH : 4.2 [l 07)

• ETCH WITH “IN f←→OUT” TO INDICATE PROPER ORIENTATION. D>
• ETCH WITH NORMAL SENSITIVITY, AS IT APPEARS ON SPEC SHEET.
• Phone: 716-684-0001
• Fax: 716-684-0987
• E-Mail: electronics@pcb.com

References

• All-guides – Innovative Search Service of Online Manuals
• PCB Piezotronics | Sensors to measure vibration, acoustics, force, pressure, load, strain, shock & torque

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